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    $ mknod backpipe p
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    $ nc -l -p [localport] 0< backpipe |
        nc [target ip] [port] |
        tee backpipe
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    listener-to-listener ת·¢£º
    $ nc -l -p [localport] 0< backpipe |
        nc -l -p [localport2] |
        tee backpipe
   
    client-to-client ת·¢£º
    $ nc [ip1] [port1] 0< backpipe |
        nc [ip2] [port2] |
        tee backpipe
   
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    $ echo nc [ip] [port] > relay.sh
    $ chmod +x relay.sh
    $ nc -l -p [port2] -e relay.sh
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